[Interest] Container members in abstract base class?

[Constantin Makshin]

There's also qgraphicsitem_cast made specifically for casting to classes
derived from QGraphicsItem.
On May 23, 2013 11:47 AM, "André Somers" <andre at familiesomers.nl> wrote:

>  Op 22-5-2013 22:42, Jonathan Greig schreef:
>
> I did check the qobject_cast docs and noticed that, but I wasn't
> inheriting from QObject and haven't needed signals or slots in the items in
> my scene. I'm trying to keep the item classes as light as possible for
> speed and memory. The items are CAD objects, so "40,000 chips" demo is in
> line with what I'm trying to achieve. I'm in charge of GUI/Linux
> development on Embroidermodder 2. It's not uncommon to have more than
> 10,000 stitches in a design file.
>
> Obviously. I did notice that you were using QGraphicsItem, and I realized
> that that doesn't inherit QObject, hence the original suggestion to use
> dynamic_cast<>. The reply was aimed at Thiago's comment, not at your
> orignal problem anymore. Specifically at this comment:
>
> >> And another rule of thumb: dynamic_casts are always checked[*], all the
> other casts are never checked.
>
> André
>
>  - Swyped from my droid.
>
> On May 22, 2013 3:13 PM, "Andre Somers" <andre at familiesomers.nl> wrote:
>
> Op 22-5-2013 21:34, Thiago Macieira schreef:
>
> > On quarta-feira, 22 de maio de 2013 16.52.29, Jonathan Greig wrote:
> >> Thank you André. The dynami...
> You're overlooking our very own qobject_cast. That one works on QObject
> derived classes without requiring the use of RTTI in the compiler, and
> work across library boundaries. So, if your class inherits QObject, I'd
> prefer qobject_cast instead.
>
> André
>
>
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